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4.3 Piping Connections
(1) Required Upstream Straight Pipe Length
If various joints are used upstream of the detector outlet, the straight pipe length as
shown in Table 4.3 is required.
Table 4.3 Required straight pipe length on the upstream side
L: Required straight pipe length—straight pipe length plus half length of the detector.
D: Nominal bore size (diameter)
NOTES
The length of a reducer, if connected, can be counted as a part of the straight pipe length.
No straight pipe length is needed on the downstream side. If a butterfly valve is installed downstream of the
detector, do not let the valve plate protrude into the pipe of the detector
L=5D L=10D
(
1
)
90°
b
ent
(2) Tee
(3) Diffuser
(4) Fully opened sluice valve
(5) Other valves (not fully opened)
L
L
L
L
L